CN111004966A - Method for improving application performance of nodular cast iron on mine car wheel - Google Patents
Method for improving application performance of nodular cast iron on mine car wheel Download PDFInfo
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- CN111004966A CN111004966A CN201911409265.6A CN201911409265A CN111004966A CN 111004966 A CN111004966 A CN 111004966A CN 201911409265 A CN201911409265 A CN 201911409265A CN 111004966 A CN111004966 A CN 111004966A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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Abstract
The invention relates to the technical field of new material processing, and discloses a method for improving the application performance of nodular cast iron on a mine car wheel, which explores the influence on the product performance in the process of smelting the nodular cast iron through the research on composite nano particles, adds the prepared composite nano particles, an inoculant and a nodulizer into a casting ladle, further pours molten iron into the casting ladle, and prepares a high-strength nodular cast iron part, so that the performance of the nodular cast iron is comprehensively improved, the operation safety of the mine car wheel is improved, and the service life of the mine car wheel is prolonged; the invention can obviously improve the application performance of the nodular cast iron on the mine car wheel, solves the defect problem existing in the replacement of cast steel by the nodular cast iron, improves the strength and toughness of the nodular cast iron, has stable chemical and mechanical properties and good formability, expands the application occasions of the nodular cast iron, and obviously improves the economic benefit and the safety benefit.
Description
Technical Field
The invention belongs to the technical field of new material processing, and particularly relates to a method for improving the application performance of nodular cast iron on a mine car wheel.
Background
The mine car is a narrow-gauge railway transport vehicle for transporting bulk materials such as coal, ore, waste rocks and the like in a mine and generally needs to be towed by a locomotive or a winch. The mine cars are divided into 5 types, namely fixed mine cars (material cars and flat cars), tipping bucket mine cars, unilateral curved rail side dump mine cars, bottom (side) dump mine cars and shuttle mine cars, according to different structures and different unloading modes. The expansion wheel is used as a main part of the mine car and plays a role in running and bearing load.
At present, the processing material commonly adopted by the mine car wheel is cast steel, and the strength of the cast steel is higher than that of a cast iron material. However, steel castings are less shock absorbing, wear resistant and maneuverable than iron castings and are more costly than iron castings. Therefore, there are continuous attempts to apply the nodular cast iron material to the mine car wheel, and in the prior art, the performance of the nodular cast iron material is improved by adding alloy elements (such as copper, molybdenum, nickel and the like), so that the mechanical strength of the mine car wheel is improved to a certain extent, but the high load requirement of the mine car load cannot be met, and the cost is increased due to the addition of the alloy. Meanwhile, the mine car still needs to bear the conditions of large-amplitude swing, inertia effect and the like during operation, and the cast iron material is seriously abraded soon after being used, so that not only is a large amount of manpower, material resources and financial resources lost, but also great potential safety hazards exist. Therefore, the wear resistance of the cast iron material must be further improved in the processing application of the mine car wheel so as to ensure the use safety, which has important significance for exerting the advantages of the cast iron material.
Disclosure of Invention
The invention aims to solve the existing problems, provides a method for improving the application performance of nodular cast iron on a mine car wheel, improves the strength and toughness of the nodular cast iron, has stable chemical and mechanical properties and good forming performance, and widens the application occasions of the nodular cast iron.
The invention is realized by the following technical scheme:
a method for improving the application performance of nodular cast iron on a mine car wheel has the preferable scheme that prepared composite nano particles, an inoculant and a nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, and a nodular cast iron piece with high strength performance is prepared;
specifically, the method comprises the following steps:
preparing composite nano particles: weighing 3.85-3.90 g of titanium boride micro powder, placing the titanium boride micro powder in a beaker, adding 60-70 ml of ethanol into the beaker, carrying out ultrasonic treatment for 15-20 min, then adding 1.70-1.76 g of prepared nano yttrium oxide and 0.8-1.0 g of hexamethyldisilazane, continuing carrying out ultrasonic treatment for 40-50 min, centrifuging at the rotating speed of 3000 plus materials and 3400 r/min by adopting a high-speed centrifuge, separating to obtain a precipitate, drying in a vacuum drying box at 70-90 ℃ for 5-7 h to obtain dry powder, placing the dry powder in a mortar, grinding and mixing uniformly, placing in a sintering furnace, heating to 780 plus materials 800 ℃ under the protection of argon, carrying out heat preservation and calcination for 1.5-2.0 h, and naturally cooling to room temperature to obtain the composite nano particles. The particle size of the titanium boride micro powder is 0.4-0.8 micron.
The preparation method of the nano yttrium oxide powder comprises the following steps: weighing 9.3-9.5 millimoles of yttrium chloride hexahydrate, placing the yttrium chloride hexahydrate in a beaker, adding 135-140 milliliters of ethylene glycol and 20-25 milliliters of sodium oleate aqueous solution with the mass concentration of 3.0-3.4 percent into the beaker, continuously stirring for 30-40 minutes, then adding 2.0-2.2 grams of polyethylene glycol, ultrasonically mixing for 10-15 minutes, transferring the mixture into a high-pressure reaction kettle, setting the reaction temperature to be 185-190 ℃, the reaction time to be 13-15 hours and the reaction pressure to be 1.28-1.30MPa, pouring out supernatant liquid after the reaction is finished, sequentially using deionized water and absolute ethyl alcohol to respectively carry out centrifugal washing for 3-5 times, drying the obtained product in a vacuum drying box at the temperature of 60-70 ℃ for 6-8 hours, and preparing the nano yttrium oxide powder with high purity, uniformly dispersed particle size and particle size of 20-25 nanometers.
Placing a ball-milling cast iron smelting raw material prepared according to the element content in an electric furnace for heating, raising the temperature of the smelting to 1500-; the inoculant is 75SiFe, the particle size is 1-3 mm, and the addition amount of the inoculant accounts for 0.09-0.10% of the mass of the molten iron; the nodulizer is FeSiMg8RE, the particle size is 1-5 mm, and the addition amount accounts for 1.25-1.30% of the mass of the molten iron; after the materials in the casting ladle are placed, molten iron begins to be cast into the casting ladle, the tapping temperature of the molten iron is 1460-1470 ℃, after the molten iron is completely flushed into the casting ladle, slag is removed from the ladle, all slag is removed, a slag removing agent is scattered on the liquid surface, then the prepared sand mold is cast, the casting temperature is 1380-1400 ℃, and a stream inoculation agent accounting for 0.06-0.08% of the mass of the molten iron is added during the casting, so that the casting is completed. The deslagging agent is perlite; the stream inoculant is 63 SiFe.
The ball-milling cast iron smelting raw material mainly comprises the following components in percentage by mass: 3.6 to 3.8 percent of carbon, 2.3 to 2.4 percent of silicon, 0.45 to 0.55 percent of manganese, 0.04 to 0.06 percent of tin, 0.006 to 0.008 percent of antimony and the balance of iron.
By adding trace amount of composite nano particles into the nodular cast iron, lath-shaped and irregular ferrite is converted into needle-point ferrite, the formation of pearlite can be remarkably promoted, the spacing between sheets is refined, the number of graphite spheres is increased, the spheroidization rate is improved, the structure is more uniform, crystal grains are refined, the high-strength nodular cast iron is prepared, the hardness is improved by 30-34%, and the abrasion loss is 5.0-6.0% of that of common nodular cast iron under high load.
Compared with the prior art, the invention has the following advantages: in order to solve the problem of poor application effect of nodular cast iron materials on the mine car wheel, the invention provides a method for improving the application performance of nodular cast iron on the mine car wheel, through research on composite nano particles, the influence on the product performance in the smelting process of the nodular cast iron is explored, the prepared composite nano particles, an inoculant and a nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, and a nodular cast iron piece with high strength performance is prepared, so that the performance of the nodular cast iron is comprehensively improved, the operation safety of the cast iron mine car wheel is improved, and the service life of the cast iron mine car wheel is prolonged; the invention can obviously improve the application performance of the nodular cast iron on the mine car wheel, solves the defect problem existing in the replacement of cast steel by the nodular cast iron, improves the strength and toughness of the nodular cast iron, has stable chemical and mechanical properties and good formability, expands the application occasions of the nodular cast iron, and obviously improves the economic benefit and the safety benefit. The invention effectively solves the problem of life and property safety caused by insufficient strength and poor wear resistance of the nodular cast iron ore wheel, has the characteristics of low cost, low energy consumption and high performance, greatly improves the wear resistance and corrosion resistance of the nodular cast iron ore wheel, has good low-temperature toughness and strong oxidation resistance, is beneficial to the balanced improvement of the performances of all aspects of the nodular cast iron ore wheel, can realize the practical significance of promoting the development of the nodular cast iron ore wheel manufacturing industry and improving the market competitiveness, has higher value for the research and application of the wear resistance of the nodular cast iron ore wheel, obviously promotes the rapid development and the sustainable development of the research field of the nodular cast iron ore wheel, and is a technical scheme which is extremely worthy of popularization and use.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
A method for improving the application performance of nodular cast iron on a mine car wheel has the preferable scheme that prepared composite nano particles, an inoculant and a nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, and a nodular cast iron piece with high strength performance is prepared;
specifically, the method comprises the following steps:
s1: preparing composite nano particles: weighing 3.85 g of titanium boride micro powder, placing the titanium boride micro powder in a beaker, adding 60 ml of ethanol into the beaker, carrying out ultrasonic treatment for 15 minutes, then adding 1.70 g of prepared nano yttrium oxide and 0.8 g of hexamethyldisilazane, continuing the ultrasonic treatment for 40 minutes, centrifuging at the rotating speed of 3000 r/min by using a high-speed centrifuge, separating to obtain a precipitate, drying in a vacuum drying oven at 70 ℃ for 5 hours to obtain dry powder, placing the dry powder in a mortar, grinding and mixing uniformly, placing in a sintering furnace, heating to 780 ℃ under the protection of argon, carrying out heat preservation and calcination for 1.5 hours, and naturally cooling to room temperature to obtain the composite nano particles. The particle size of the titanium boride micro powder is 0.4-0.8 micron.
The preparation method of the nano yttrium oxide powder comprises the following steps: weighing 9.3 mmol of yttrium chloride hexahydrate, placing the yttrium chloride hexahydrate in a beaker, adding 135 ml of ethylene glycol and 20 ml of sodium oleate aqueous solution with the mass concentration of 3.0% into the beaker, continuously stirring for 30 minutes, then adding 2.0 g of polyethylene glycol, ultrasonically mixing for 10 minutes, transferring the mixture into a high-pressure reaction kettle, setting the reaction temperature to be 185 ℃, the reaction time to be 13 hours and the reaction pressure to be 1.28MPa, pouring out supernatant liquid after the reaction is finished, sequentially using deionized water and absolute ethyl alcohol to respectively carry out centrifugal washing for 3 times, and drying the obtained product in a vacuum drying oven at 60 ℃ for 6 hours to prepare nano yttrium oxide powder with high purity, uniform particle size dispersion and particle size between 20 and 25 nanometers.
S2: melting and pouring: placing a ball-milling cast iron smelting raw material prepared according to the element content into an electric furnace to be heated, raising the temperature to 1500 ℃ for smelting, continuing to smelt for 5 minutes, removing floating slag on molten iron melt after the molten iron is completely smelted, detecting the components of the molten iron to enable the element content to meet the preparation requirement, and then adding the prepared composite nano particles, an inoculant and a nodulizer into a casting ladle, wherein the addition amount of the composite nano particles accounts for 0.016 percent of the mass of the molten iron; the inoculant is 75SiFe, the particle size is 1-3 mm, and the addition amount accounts for 0.09% of the mass of the molten iron; the nodulizer is FeSiMg8RE, the particle size is 1-5 mm, and the addition amount accounts for 1.25% of the mass of the molten iron; after the materials in the casting ladle are placed, molten iron begins to be cast into the casting ladle, the tapping temperature of the molten iron is 1460 ℃, the molten iron is completely poured into the casting ladle, slag is removed from the ladle, all slag is removed, a slag removing agent is sprinkled on the liquid level, then the manufactured sand mold is cast, the casting temperature is 1380 ℃, and a flow-following inoculant accounting for 0.06 percent of the mass of the molten iron is added during casting to finish casting. The deslagging agent is perlite; the stream inoculant is 63 SiFe.
The ball-milling cast iron smelting raw material mainly comprises the following components in percentage by mass: 3.6% of carbon, 2.3% of silicon, 0.45% of manganese, 0.04% of tin, 0.006% of antimony and the balance of iron.
Example 2
A method for improving the application performance of nodular cast iron on a mine car wheel has the preferable scheme that prepared composite nano particles, an inoculant and a nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, and a nodular cast iron piece with high strength performance is prepared;
specifically, the method comprises the following steps:
s1: preparing composite nano particles: weighing 3.87 g of titanium boride micro powder, placing the titanium boride micro powder in a beaker, adding 65 ml of ethanol into the beaker, carrying out ultrasonic treatment for 18 minutes, then adding 1.73 g of prepared nano yttrium oxide and 0.9 g of hexamethyldisilazane, continuing the ultrasonic treatment for 45 minutes, centrifuging at the rotating speed of 3200 rpm by using a high-speed centrifuge, separating to obtain a precipitate, drying in a vacuum drying oven at the temperature of 80 ℃ for 6 hours to obtain dry powder, placing the dry powder in a mortar, grinding and mixing uniformly, placing in a sintering furnace, heating to 790 ℃ under the protection of argon, carrying out heat preservation and calcination for 1.8 hours, and naturally cooling to room temperature to obtain the composite nano particles. The particle size of the titanium boride micro powder is 0.4-0.8 micron.
The preparation method of the nano yttrium oxide powder comprises the following steps: weighing 9.4 mmol of yttrium chloride hexahydrate, placing the yttrium chloride hexahydrate in a beaker, adding 138 ml of ethylene glycol and 22 ml of sodium oleate aqueous solution with the mass concentration of 3.2% into the beaker, continuously stirring for 35 minutes, then adding 2.1 g of polyethylene glycol, ultrasonically mixing for 12 minutes, transferring the mixture into a high-pressure reaction kettle, setting the reaction temperature to be 188 ℃, the reaction time to be 14 hours and the reaction pressure to be 1.29MPa, pouring out supernatant liquid after the reaction is finished, sequentially using deionized water and absolute ethyl alcohol to respectively carry out centrifugal washing for 4 times, and drying the obtained product in a 65 ℃ vacuum drying oven for 7 hours to prepare nano yttrium oxide powder with high purity, uniform particle size dispersion and particle size of 20-25 nanometers.
S2: melting and pouring: heating a ball-milling cast iron smelting raw material prepared according to the element content in an electric furnace, heating the smelting to 1530 ℃, continuing to smelt for 8 minutes, removing floating slag on molten iron after the smelting is completely melted, detecting the components of the molten iron to enable the element content to meet the preparation requirement, and then adding the prepared composite nano particles, an inoculant and a nodulizer into a casting ladle, wherein the addition amount of the composite nano particles accounts for 0.017 percent of the mass of the molten iron; the inoculant is 75SiFe, the particle size is 1-3 mm, and the addition amount accounts for 0.095% of the mass of the molten iron; the nodulizer is FeSiMg8RE, the particle size is 1-5 mm, and the addition amount accounts for 1.28% of the mass of the molten iron; after the materials in the casting ladle are placed, molten iron begins to be cast into the casting ladle, the tapping temperature of the molten iron is 1465 ℃, the molten iron is completely poured into the casting ladle, slag is removed from the ladle, all slag is removed, a slag removing agent is sprinkled on the liquid level, then the manufactured sand mold is cast, the casting temperature is 1390 ℃, and an in-flow inoculant accounting for 0.07 percent of the mass of the molten iron is added during the casting, so that the casting is finished. The deslagging agent is perlite; the stream inoculant is 63 SiFe.
The ball-milling cast iron smelting raw material mainly comprises the following components in percentage by mass: 3.7% of carbon, 2.35% of silicon, 0.50% of manganese, 0.05% of tin, 0.007% of antimony and the balance of iron.
Example 3
A method for improving the application performance of nodular cast iron on a mine car wheel has the preferable scheme that prepared composite nano particles, an inoculant and a nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, and a nodular cast iron piece with high strength performance is prepared;
specifically, the method comprises the following steps:
s1: preparing composite nano particles: weighing 3.90 g of titanium boride micro powder, placing the titanium boride micro powder in a beaker, adding 70 ml of ethanol into the beaker, carrying out ultrasonic treatment for 20 minutes, then adding 1.76 g of prepared nano yttrium oxide and 1.0 g of hexamethyldisilazane, continuing the ultrasonic treatment for 50 minutes, centrifuging at the rotating speed of 3400 r/min by using a high-speed centrifuge, separating to obtain a precipitate, drying in a vacuum drying oven at 90 ℃ for 7 hours to obtain dry powder, placing the dry powder in a mortar, grinding and mixing uniformly, placing in a sintering furnace, heating to 800 ℃ under the protection of argon, carrying out heat preservation and calcination for 2.0 hours, and naturally cooling to room temperature to obtain the composite nano particles. The particle size of the titanium boride micro powder is 0.4-0.8 micron.
The preparation method of the nano yttrium oxide powder comprises the following steps: weighing 9.5 mmol of yttrium chloride hexahydrate, placing the yttrium chloride hexahydrate in a beaker, adding 140 ml of ethylene glycol and 25 ml of sodium oleate aqueous solution with the mass concentration of 3.4% into the beaker, continuously stirring for 40 minutes, then adding 2.2 g of polyethylene glycol, ultrasonically mixing for 15 minutes, transferring the mixture into a high-pressure reaction kettle, setting the reaction temperature to be 190 ℃, the reaction time to be 15 hours and the reaction pressure to be 1.30MPa, pouring out supernatant liquid after the reaction is finished, sequentially using deionized water and absolute ethyl alcohol to respectively carry out centrifugal washing for 5 times, and drying the obtained product in a vacuum drying oven at 70 ℃ for 8 hours to prepare nano yttrium oxide powder with high purity, uniform particle size dispersion and particle size of 20-25 nanometers.
S2: melting and pouring: heating a ball-milling cast iron smelting raw material prepared according to the element content in an electric furnace, raising the temperature to 1550 ℃ during smelting, continuing to smelt for 10 minutes, removing floating slag on molten iron after the molten iron is completely smelted, detecting the components of the molten iron to enable the element content to meet the preparation requirement, and then adding the prepared composite nano particles, an inoculant and a nodulizer into a casting ladle, wherein the addition amount of the composite nano particles accounts for 0.018 mass percent of the molten iron; the inoculant is 75SiFe, the particle size is 1-3 mm, and the addition amount accounts for 0.10% of the mass of the molten iron; the nodulizer is FeSiMg8RE, the particle size is 1-5 mm, and the addition amount accounts for 1.30% of the mass of the molten iron; after the materials in the casting ladle are placed, molten iron begins to be cast into the casting ladle, the tapping temperature of the molten iron is 1470 ℃, after the molten iron is completely poured into the casting ladle, slag is removed from the ladle, all slag is removed, a slag removing agent is scattered on the liquid level, then the manufactured sand mold is cast, the casting temperature is 1400 ℃, and a stream inoculation agent accounting for 0.08 percent of the mass of the molten iron is added during the casting, so that the casting is completed. The deslagging agent is perlite; the stream inoculant is 63 SiFe.
The ball-milling cast iron smelting raw material mainly comprises the following components in percentage by mass: 3.8% of carbon, 2.4% of silicon, 0.55% of manganese, 0.06% of tin, 0.008% of antimony and the balance of iron.
Example 4
The difference from example 1 is that the composite nanoparticle preparation addition is omitted and equivalent amount of titanium boride fine powder having a particle size of 0.4-0.8 μm is used instead.
Example 5
The difference from example 1 is that the composite nanoparticle preparation addition was omitted and the same amount of nano yttrium oxide powder with a particle size between 20-25 nm was used instead.
Control group
4130 structural steel material was used as a control.
And (3) performing shot blasting treatment on the products obtained by processing each group, machining the products into test bars with the diameter of 8 cm and the length of 60 cm, taking the test bars as test samples (5 pieces in each group), keeping independent variables consistent, and performing performance test. And summarizing the test data, removing invalid data, and taking the average value of the valid data as a final result. The test results are shown in the following table:
| item | Hardness (HBW) | Yield strength (MPa) | Tensile strength (MPa) | Elongation after rupture (%) |
| Example 1 | 475 | 297 | 1568 | 20.6 |
| Example 2 | 479 | 301 | 1572 | 20.8 |
| Example 3 | 477 | 299 | 1570 | 20.7 |
| Example 4 | 318 | 216 | 1085 | 13.4 |
| Example 5 | 315 | 215 | 1056 | 14.2 |
| Control group | 361 | 246 | 1220 | 7.6 |
The invention effectively solves the problem of life and property safety caused by insufficient strength and poor wear resistance of the nodular cast iron ore wheel, has the characteristics of low cost, low energy consumption and high performance, greatly improves the wear resistance and corrosion resistance of the nodular cast iron ore wheel, has good low-temperature toughness and strong oxidation resistance, is beneficial to the balanced improvement of the performances of all aspects of the nodular cast iron ore wheel, can realize the practical significance of promoting the development of the nodular cast iron ore wheel manufacturing industry and improving the market competitiveness, has higher value for the research and application of the wear resistance of the nodular cast iron ore wheel, obviously promotes the rapid development and the sustainable development of the research field of the nodular cast iron ore wheel, and is a technical scheme which is extremely worthy of popularization and use.
Claims (7)
1. A method for improving the application performance of nodular cast iron on a mine car wheel is characterized in that prepared composite nano particles, an inoculant and a nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, and a nodular cast iron part is prepared; the preparation method of the composite nano-particles comprises the following steps:
(1) weighing 9.3-9.5 millimoles of yttrium chloride hexahydrate, placing the yttrium chloride hexahydrate in a beaker, adding 135-140 milliliters of ethylene glycol and 20-25 milliliters of sodium oleate aqueous solution into the beaker, continuously stirring for 30-40 minutes, then adding 2.0-2.2 grams of polyethylene glycol, ultrasonically mixing for 10-15 minutes, transferring the mixture into a high-pressure reaction kettle, setting the reaction temperature to be 185-190 ℃, the reaction time to be 13-15 hours and the reaction pressure to be 1.28-1.30MPa, pouring out supernatant liquid after the reaction is finished, respectively centrifugally washing for 3-5 times by sequentially using deionized water and absolute ethyl alcohol to dry the product in a vacuum drying box at 60-70 ℃ for 6-8 hours, and preparing nano yttrium oxide powder with the particle size of 20-25 nanometers;
(2) weighing 3.85-3.90 g of titanium boride micro powder, placing the titanium boride micro powder in a beaker, adding 60-70 ml of ethanol into the beaker, carrying out ultrasonic treatment for 15-20 min, then adding 1.70-1.76 g of nano yttrium oxide obtained in the step (1) and 0.8-1.0 g of hexamethyldisilazane, continuing carrying out ultrasonic treatment for 40-50 min, centrifuging at the rotation speed of 3000 plus materials 3400 r/min by adopting a high-speed centrifuge, separating to obtain a precipitate, drying in a vacuum drying box at 70-90 ℃ for 5-7 h to obtain dry powder, placing the dry powder in a mortar, grinding and mixing uniformly, placing in a sintering furnace, heating to 780 plus materials 800 ℃ under the protection of argon, carrying out heat preservation and calcination for 1.5-2.0 h, and naturally cooling to room temperature to obtain the composite nano particles.
2. The method for improving the application performance of the ductile iron on the mine car wheel according to claim 1, wherein the addition amount of the composite nano particles is 0.016-0.018% of the mass of the molten iron.
3. The method for improving the application performance of the ductile iron on the mine car wheel according to claim 1, wherein the mass concentration of the aqueous solution of sodium oleate in the step (1) is 3.0-3.4%.
4. The method for improving the application performance of the ductile iron on the mine car wheel according to claim 1, wherein the particle size of the titanium boride micro powder in the step (2) is between 0.4 and 0.8 micron.
5. The method of claim 1, wherein the inoculant comprises 75SiFe, the grain size is between 1 mm and 3 mm, and the inoculant comprises 0.09-0.10% by mass of molten iron.
6. The method for improving the application performance of the ductile iron on the mine car wheel as claimed in claim 1, wherein the nodulizer is FeSiMg8RE, the particle size is 1-5 mm, and the addition amount is 1.25-1.30% of the mass of the molten iron.
7. The method for improving the application performance of the ductile iron to the mine car wheel according to claim 1, wherein the molten iron comprises the following main component elements in percentage by mass: 3.6 to 3.8 percent of carbon, 2.3 to 2.4 percent of silicon, 0.45 to 0.55 percent of manganese, 0.04 to 0.06 percent of tin, 0.006 to 0.008 percent of antimony and the balance of iron.
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| CN112157372A (en) * | 2020-09-29 | 2021-01-01 | 灵璧县飞松机械制造有限责任公司 | Activator for welding aluminum alloy part in grain throwing machine |
| CN117753928A (en) * | 2024-02-22 | 2024-03-26 | 潍坊卓安重工科技有限公司 | lost foam casting method for manufacturing ball mill end cover by utilizing spheroidal graphite cast iron |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112157372A (en) * | 2020-09-29 | 2021-01-01 | 灵璧县飞松机械制造有限责任公司 | Activator for welding aluminum alloy part in grain throwing machine |
| CN112157372B (en) * | 2020-09-29 | 2022-07-19 | 灵璧县飞松机械制造有限责任公司 | Activator for welding aluminum alloy part in grain throwing machine |
| CN117753928A (en) * | 2024-02-22 | 2024-03-26 | 潍坊卓安重工科技有限公司 | lost foam casting method for manufacturing ball mill end cover by utilizing spheroidal graphite cast iron |
| CN117753928B (en) * | 2024-02-22 | 2024-04-26 | 潍坊卓安重工科技有限公司 | Lost foam casting method for manufacturing ball mill end cover by utilizing spheroidal graphite cast iron |
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Application publication date: 20200414 |